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Link Metrics for the Mobile Ad Hoc Network (MANET) Routing Protocol OLSRv2 - Rationale
RFC 7185

Internet Engineering Task Force (IETF)                       C. Dearlove
Request for Comments: 7185                               BAE Systems ATC
Category: Informational                                       T. Clausen
ISSN: 2070-1721                                 LIX, Ecole Polytechnique
                                                              P. Jacquet
                                                Alcatel-Lucent Bell Labs
                                                              April 2014

                 Rationale for the Use of Link Metrics
    in the Optimized Link State Routing Protocol Version 2 (OLSRv2)

Abstract

   The Optimized Link State Routing Protocol version 2 (OLSRv2) includes
   the ability to assign metrics to links and to use those metrics to
   allow routing by other than minimum hop count routes.  This document
   provides a historic record of the rationale for, and design
   considerations behind, how link metrics were included in OLSRv2.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7185.

Copyright Notice

   Copyright (c) 2014 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must

Dearlove, et al.              Informational                     [Page 1]
RFC 7185                   OLSRv2 Link Metrics                April 2014

   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Table of Contents

   1. Introduction ....................................................3
   2. Terminology .....................................................5
   3. Applicability ...................................................5
   4. Motivational Scenarios ..........................................5
   5. Link Metrics ....................................................7
      5.1. Link Metric Properties .....................................7
      5.2. Link Metric Types ..........................................8
      5.3. Directional Link Metrics ..................................10
      5.4. Reporting Link and Neighbor Metrics .......................10
      5.5. Defining Incoming Link Metrics ............................12
      5.6. Link Metric Values ........................................12
   6. MPRs with Link Metrics .........................................14
      6.1. Flooding MPRs .............................................14
      6.2. Routing MPRs ..............................................16
      6.3. Relationship between MPR Sets .............................19
   7. Security Considerations ........................................21
   8. Acknowledgements ...............................................21
   9. Informative References .........................................21
   Appendix A.  MPR Routing Property .................................23

Dearlove, et al.              Informational                     [Page 2]
RFC 7185                   OLSRv2 Link Metrics                April 2014

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